Thunder is a 2015 introduced background character. In Seeing Red, she is voiced by Cree Summer.
Thunder is a young lady with dark skin, brown eyes and dark brown hair in a ponytail. She wears a black and yellow jumpsuit with a yellow arrow pointing down the center of her torso, yellow sleeves, and black pants, as well as yellow boots.
Thunder argues with her sister; Lightning over a hairband, thanks to the effects of a red kryptomite.